I bought a rebuildable CE4 clearomizer around a month ago, and I noticed after vaping on it this morning that it looked like it had warped. A closer inspection showed that the metal piece in the middle below the wicks looked like it was stuck to one side. I had been using it on an Ego Twist at 3.2 volts this morning, but also on an Apoloe Mini battery sometimes. What would have caused this and how can I keep it from happening to my other ones?